Demountable rim



DEMOUNTABLE RIM Filed DBC. 14 1921 Patented July 31, 1923.

stares aras-r VALFRED L. rouoH, OFATLANTA, esonera.

'nnluo'unfrannn niet.

Application filed December 14, leer. serial no. 522,217.

To all 'whom t may concern.'

Be it lrnown that I, ALFRED L,- Fouorrn, a citizen of the United States, and a resident of Atlanta, in the county of Fulton an State of Georgia, have invented certain new and useful lmprovementsin Demountable Rims,

f of which the followin is a snecication.

The principal purpose of .this invention is ,to provide a vehicle tire rim, of theV demountable type, which permits the ready application or removal of a tire in an easy and convenient manner.

A further object is to provide a rim comprising two side elements connected by a central lapped joint, of relatively large area, having undercut edge surfaces, acting as annular vstops and presenting smooth regular surfaces upon both sides of the rim,

Another object is, iin the provision` oit easily applied or removedconnecting members which resist any'strain tending to separate the side elements when in operative position.

Further objects are, to provide rims oi" superior eiliciency and durability, that are economical in manufacture andsimple in operation, no tools being required in mounting or demounting a tire therein.

These and analogous objects, which will become evident as the description progresses, are attained by the novel construction, combination and arrangement of parts, hereinafter described and shownin the accompanying drawings, forming a material part of this' disclosure, and in which Figure 1 is a perspective view .showing a demountablc rim made in accordance with the invention.

Figure 2 is anenlarged fragmentary view ot the main elements of the rim, as separated and showing a transverse sec-tion of the same, with adjacent clamp plate.

Figure 3 is a similar view of the same. as in operative position on a wheel `telly.

Figure 4 is a fragmentary viewv looking from the interior of the rim.

Referring to the drawing, now in particular to Figure 3, a wooden wheel telly is desjacent metal band 11.

To one side of the telly, usually adjacent the vehicle, is secured a fiat ring 12 having a projection 13 over the band 11 and continuing circumferentially outward, its edge, 14 is bent laterally outward as shown.

ignated by the numeral 10, having a circum-' @nth/e other side of the wheell area plurality of clips l'having inwardly projecting elements 16 and outturned outer edges 17.

The clips are held by bolts 18 provided witliznuts 19 or other similar fastening means,` notgermane to the invention, and it is -to be understood that all of the elements hitherto enumerated are'l used merely as illustrative of conventional types of wheel construction.Y f

The invention specifically consists inthe construction of the parts disposed over the band 11 and comprises-a pair of rim elements, generally designated by the numerals 2O and 'p30 respectively positioned adjacent the ring 12 and clips 15.

kThe element 20 has a ysmooth flat outer surface ifashionedinto an endless ring,its`inner or rneetingedge 21 being bevelled outwardly and its opposite, outer portion .formed into a iiange 22 terminating in an out-turned rounded edge 23. w

The opposite, outer element 30 has an exposed outer surface of approximately one half that of the corresponding surface 20, or one third of the width ofthe tire used in connection. i y

The edge 31 is undercut and fitted to receive the extending bevelled edge 21 and the outer portion of the element is formed into a flange 32 terminating in a roundedy edge 33, the flanges of both elements being similar but opposite in all respects.

A circumferential extension 34 of reduced thickness projects from the edge 31 towards the mating element, its width beingsubstantially one third of the distance between the anges, and its inner surface is disposed in register with the element 30. Y

The outer surface of the extension 34CA is gradually reduced in thickness, as by scarfing, from the undercut edge 31 to the bevelled edge 35 andthe vinner'surface 24 of thev element 20 is increased in thickness from its bevelled edge 21'to a step' 25, this step being In order to maintain the elements in such relation, pairs of pins 26 are fixed inthe element 2O to extend through and beyond its inner surface at several points in its circumlference, four being shown in the drawing.

The element 30 is similarly provided with like fixed pins 36 so arranged as to aline with the pins 26.

When so alined, the pins maybe readily entered Vin pairs of openings 27 and 37 formed through plates 39 having bevelled end edges l() by which they can be raised and disengaged from the pins as desirable.

Formed in the extension 34 is a slotted opening 38 and in. the element 2() is a corresponding circular hole 28 through which may be passed the usual air inlet (not shown), the ,game being attached to the inner tube used in conjunction with the tire, a portion of the inlet valve being seated in the recess 29 surrounding the hole When the device is fully assembled; it will be apparent that the slot 38 permits the outer element to be applied or removed Without interference with the valve tube.

ln operation, the tire being deflated, the element 2O is entered into it, the valve passed through the opening 28 and the mating element 30 applied, pressure being used to force the elements towards each other until the edges are in contact, preventing further movement.

The plates 39 are then applied so that the several pairs of pins are engaged preventing separation of the elements, the tire mounted on the Wheel rim and inflated as usual.

In dismounting the tire, the fastenings are removed, the demountable rim slipped ol, and any convenient article, as a screw-driver,

used as a lever along the undercut edges 40 ot the clamp plates so as to remove them from engagement with the pins.

Thereupon a shock or jar given the rim suilices to cause its tWo main portions to separate, permitting removal of the tire.

Although the foregoing is descriptive oi' the preferred embodiment of the invention, it will be apparent that minor changes may be made in its construction, Without the eX- eroise of invention or conflicting With the scope or" the claim hereto appended.

Having thus described my invention, What l claim as new and desire to secure by Letters Patent, is Y A demountable rim comprising a pair o1 bands having attenuated lateral elements arranged in overlapping relation at their circumferential joints, cylindrical pins fixed in aligned pairs to extend from the inner surliaces oit each band, clamp plates having round openings receptive of said pins to hold the plates in close relation, and bevelled extensions on the ends of said clamp plates facilitating their removal.

ln testimony whereof l' have signed my naine to this specification.

ALFRED L Foucnn. 

